To work with Google APIs, you will need Google API Console project and Client Id. Which you can use to call different Google APIs. I wanted to integrate Google Sign-In into my website. The following blog post explains how to create Google API Console project, client ID and client Secret.

Though I used it for Google+ API, the same project can be used for other API access as well. You will just need to enable additional APIs (step 7 below).

Select the “Web Application” radio button from the “Application Type”.

Enter your application name in “Name” field. This name will be shown to end users when they are asked to give login permission to your website. So please specify meaningful name which can identify your website.

In “Authorized redirect URIs” input box, enter your website URL + the page/end-point where you wanted your user redirected back. If you are using Microsoft.Owin.Security.Google library, the end-point is “/signin-google”. For example, my website url is http://yourdomain.com, so I enter http://yourdomain.com/signin-google